Metal-shears.



No. 731,312. PATENTED JUNE 16, 1903. T. F. LIPPENGOOD.

METAL SHEARS. APPLICATION FILED NOV. 15, 1902. N0 MODEL.

Ti I iii',,"

1 n m ..:m

"mi M 5 liiiili mum INVENTOH UNITED STATES Y PATENT Patented June 16, 1903.

much.

.METAL-SHEARS.

SPECIFICATION forming part of Letters Patent No. 731,312, dated June 16, 1903. Application filed November 15,1902. Serial no. 181,508. on; model.)

left hand cutting and which by having two cutting edges for the movable blade shall be capable of running for a long time without regrinding. I

It consists in the novel construction and arrangement of parts which I will now proceed.

to describe with reference to the drawings, in which- Figure 1 is an end view; Fig. 2, a plan View; Fig. 3, a side view, partly in section, on the line 3 3 of Fig. 1; and Fig. 4 is a sectional detail on line 4 4 of Fig.

In the drawings, A represents the upper and B the lower jaw of a stationary rigid framework. The upper jaw is rigidly connected to an overhanging arm 0, which extends horizontally from a vertical frameplate D, and which frame-plate is rigidly connected to a horizontal table-surface E, which at its outer edge immediately beneath the upper jaw carries the lower jaw B. On these two jaws are carried the two knives that form the cutting portions of the shears. The upper knife K is movable and the lower knife K is relatively stationary. The lower knife K occupies a vertical plane, is slotted at a; and connected adjustably to the side of thelower jaw of the frame by bolts a. The upper knife is arranged in a vertical plane immediately adjacent to the upper or cutting edge of the lower knife and is constructedand arranged to oscillate about an axial center. This knife is made with a double cutting edge, one along its upper side and the other along its lower side, and its axial center is arranged to be shifted from one end of the knife and one side of the machine to the other end of the knife and the other side of the machine, so as to adapt it for either right or left hand cutting. For this purpose it has two pivotal holes Z7 and b, one at each end,

and midway between these holes and in longitudinal position in the knife is an elongated slot b Through one or the other of the end holes I) or bthere is secured a pivot-bolt c, which connects the knife-blade to the upper jaw, and through the slot in the middle of the knife there projects a crank-pin cl from arotating disk F. This crank-pin has around it an antifriction-roller, which bears against the sides of the slot and forms a roller-bearing to reduce friction. The revolving disk F is fast upon the end of a horizontal shaft G, that rorates in hearings in the upper jaw and opposite frame-plate and carries on the end opposite the disk a gear-Wheel H. This gear-wheel is in mesh with another one, H", which is fast on a short crank-shaft H having a handcrank H for turning it and having a bearing in. an offsetting bracket H Forturning the shaft G by power a band-pulley H having a small gear-wheel H attached, transmits its powerthrough an idler H to the gear of the shaft G.

Outside of the jaws A B of the main frame there is supported a horizontal shelf T, which has flanged plates t bent down and slotted and fastened by bolts t to the lower jaw, so as to be vertically adjustable. This shelf is about at the level of the junction of the two knives, and it serves to support the sheet metal to be out. To hold the sheet metal up to theknives as it is fed along, there are two rollers r r set on the shelf-surface in a slanting or oblique position, so as to feed slightly forward toward the knives as the metal plate is pushedalong the shelf.

Inside the knives there is formed the table surface E, which receives'the sheet of metal cut ofil On this table-surface is a movable gage-flange R, connected adj ustably by setscrews 8 to the edges of the table E, so as to be adjusted closer to or farther from the knives to determine the width of the cut. "Beside this table E and fixed to the upper surface of the lower jaw B of the framework there is a flat bow-spring S, which lies be- "neath the upper knife and ispressed down by the same when the knife descends. This serves to lift the severed sheet of metal when the knife rises.

It will be seen that my upper knife is double edged and symmetrically constructed'at each end, so as to allow the pivot-pin of the knife to be shifted to the opposite side of the wristpin on the disk, for which purpose the knifeblade is simply turned over and the pivot-pin is put through the opposite end of the knife and into a corresponding hole in the upper jaw of the main frame. This converts the machine for a right-hand shears to a lefthand shears, and vice versa.

I is a guard and guide-plate, fastened to the top of the upper jaw and overlapping the' Patent, is-

the same reversible, and means for oscillating the movable knife substantially as described.

2. A shears comprising a stationary knife and a movable knife, the movable knife being formed with two opposite cutting edges, and having a pivotal bearing at each end, and a longitudinal slot in the middle, a drivingshaft with crank-pin playing in said slot, and means for rotating said shaft substantially as described.

3. A shears comprising two knives arranged in a vertical frame, and a horizontallyprojecting shelf arranged beside the knives and having on its upper surfaces oblique or diagonally-arranged rollers extending across the width of the shelf substantially as and for the purpose described.

TILGHMAN F. LIPPENGOOD.

Witnesses:

BENNETT GOYFORT, E. F. GARBER. 

